Hello to all, please help . i have a 1998 740il , the upper
raiator hose gets verry hot , but the lower radiator hose stays
cold ! when i remove the radiator cap, and rev up the engine i see
that colant rush in the tank , is this meansthe water pump is
good? i is this a stuck termostat , please advise how to replace.
many thanks Fredwash @aol.com
Thank you all , may be that why when i rev the engine i see
the water flow to the expantion tank ! i have to start from
somewhere, i am going to replace the termostat and then see !
next is water pump or radiator ? i just hate to repalce all . i have
done the cooling system bleeding . i will let you all know the
findings . Regards Fred740iL
John Burns wrote:
On Fri, 06 Oct 2006 08:38:02 -0400, Eisboch wrote:
It is my understanding(limited as that may be :) ) that the thermostat
functions as a "door" based on temperature. If the thermostat is stuck
closed then the coolant will not be able to flow through the radiatior,
cooling the engine. Thereby giving you a very hot upper hose, and a cool
lower hose. All the hot stuff stays blocked up by the faulty thermostat.
Thanks for your advised , i am going to replace the termostat
this afternoon and post my finding for all E38ters .Oh this realy
works ( PIXEL restoration instructions-for MID speedo/tach ) i have
done that, but be more carefull that i was ( bent the temp gauge
good luck to all Fred740iL
no one wrote:
HI again , in this 740 even when engine is cold and termostat
closed , there is small flow to the expantion tank. i did
replaced the termostat and upper radiator hose , after runing
the engine for about 20 min, finaly the lower radiator hose
start to warming up , but now i don't get much heat from heater
even the engine temp is in the midel ! what is next that i have
to do , repalce the water pump or radiator ? can any one tell
me in order to bleed the radiator , engine must be warm or
cold ( open termostat or closed ? ) , thanks Fred
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